A Chiral Dual-Core Organoboron Structure Realizes Dual-Channel Enhanced Ultrapure Blue Emission and Highly Efficient Circularly Polarized Electroluminescence

被引：114

作者：

Yan, Zhi-Ping ^{[1
,2
]}

Yuan, Li ^{[1
]}

Zhang, Yuan ^{[3
,4
]}

Mao, Meng-Xi ^{[1
]}

Liao, Xiang-Ji ^{[1
]}

Ni, Hua-Xiu ^{[1
]}

Wang, Zhi-Heng ^{[2
]}

An, Zhongfu ^{[3
,4
]}

Zheng, You-Xuan ^{[1
]}

Zuo, Jing-Lin ^{[1
]}

机构：

[1] Nanjing Univ, Sch Chem & Chem Engn, Jiangsu Key Lab Adv Organ Mat, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210023, Peoples R China

[2] Jihua Lab, 28 Isl Ring South Rd, Foshan 528200, Peoples R China

[3] Nanjing Tech Univ, Key Lab Flexible Elect KLOFE, Nanjing 211816, Peoples R China

[4] Nanjing Tech Univ, Inst Adv Mat IAM, Nanjing 211816, Peoples R China

来源：

ADVANCED MATERIALS | 2022年 / 34卷 / 36期

基金：

中国国家自然科学基金;

关键词：

chiral dual-core organoboron structure; circularly polarized luminescence; circularly polarized organic light-emitting diodes; multiple resonance thermally activated delayed fluorescence; narrowband emission; ACTIVATED DELAYED FLUORESCENCE; LUMINESCENCE; DICHROISM; SPECTRA; DESIGN;

D O I：

10.1002/adma.202204253

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The realization of luminescent materials with narrowband and circularly polarized luminescence (CPL) is of great significance for the development of future optical and photonic devices. Herein, through a steric-hindrance-assisted dual-core strategy, two pairs of chiral dual-core multiple resonance thermally activated delayed fluorescence (MR-TADF) materials (R/S-DOBN and R/S-DOBNT) are directly constructed by the bonding of two organoboron MR-TADF monocores (SOBN and SOBNT) with carbazole/3,6-di-tert-butyl-9H-carbazole and phenol derivative as donors, realizing obvious CPL and narrowband emissions. Furthermore, the dual-core effect in the prepared R/S-DOBN and R/S-DOBNT increases the transition oscillator strength two times more than that of a monocore structure, while maintaining the ultrapure blue emissions peaking at 453 and 459 nm with a narrower full-width at half-maximum of 21 nm through reorganization energy reduction. The circularly polarized organic light-emitting diodes based on the enantiomers exhibit ultrapure blue emission with Commission Internationale de L'Eclairage (CIE) coordinates of (0.14, 0.10) and (0.13, 0.12), high maximum external quantum efficiencies of 23.9% and 25.6%, and obvious circularly polarized electroluminescence with dissymmetry factors (|g(EL)|) approximate to 10(-3).

引用

页数：10

共 55 条

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